NHTSA Interpretation File Search
Overview
NHTSA's Chief Counsel interprets the statutes that the agency administers and the standards and regulations that it issues. Members of the public may submit requests for interpretation, and the Chief Counsel will respond with a letter of interpretation. These interpretation letters look at the particular facts presented in the question and explain the agency’s opinion on how the law applies given those facts. These letters of interpretation are guidance documents. They do not have the force and effect of law and are not meant to bind the public in any way. They are intended only to provide information to the public regarding existing requirements under the law or agency policies.
Understanding NHTSA’s Online Interpretation Files
NHTSA makes its letters of interpretation available to the public on this webpage.
An interpretation letter represents the opinion of the Chief Counsel based on the facts of individual cases at the time the letter was written. While these letters may be helpful in determining how the agency might answer a question that another person has if that question is similar to a previously considered question, do not assume that a prior interpretation will necessarily apply to your situation.
- Your facts may be sufficiently different from those presented in prior interpretations, such that the agency's answer to you might be different from the answer in the prior interpretation letter;
- Your situation may be completely new to the agency and not addressed in an existing interpretation letter;
- The agency's safety standards or regulations may have changed since the prior interpretation letter was written so that the agency's prior interpretation no longer applies; or
- Some combination of the above, or other, factors.
Searching NHTSA’s Online Interpretation Files
Before beginning a search, it’s important to understand how this online search works. Below we provide some examples of searches you can run. In some cases, the search results may include words similar to what you searched because it utilizes a fuzzy search algorithm.
Single word search
Example: car
Result: Any document containing that word.
Multiple word search
Example: car seat requirements
Result: Any document containing any of these words.
Connector word search
Example: car AND seat AND requirements
Result: Any document containing all of these words.
Note: Search operators such as AND or OR must be in all capital letters.
Phrase in double quotes
Example: "headlamp function"
Result: Any document with that phrase.
Conjunctive search
Example: functionally AND minima
Result: Any document with both of those words.
Wildcard
Example: headl*
Result: Any document with a word beginning with those letters (e.g., headlamp, headlight, headlamps).
Example: no*compl*
Result: Any document beginning with the letters “no” followed by the letters “compl” (e.g., noncompliance, non-complying).
Not
Example: headlamp NOT crash
Result: Any document containing the word “headlamp” and not the word “crash.”
Complex searches
You can combine search operators to write more targeted searches.
Note: The database does not currently support phrase searches with wildcards (e.g., “make* inoperative”).
Example: Headl* AND (supplement* OR auxiliary OR impair*)
Result: Any document containing words that are variants of “headlamp” (headlamp, headlights, etc.) and also containing a variant of “supplement” (supplement, supplemental, etc.) or “impair” (impair, impairment, etc.) or the word “auxiliary.”
Search Tool
NHTSA's Interpretation Files Search
| Interpretations | Date |
|---|---|
ID: 11018Open Mr. Bryan G. Nelson Dear Mr. Nelson: Thank you for your letter asking for confirmation that the National Highway Traffic Safety Administration (NHTSA) recommends, but does not require, school buses to be yellow. Your understanding is correct. NHTSA's recommendation that school buses be painted yellow is found in Highway Safety Program Guideline 17, "Pupil Transportation Safety" (copy enclosed). Guideline 17 consists of recommendations for State pupil transportation safety programs. Guideline 17 will affect the operation of school buses in your area only if it has been adopted by your State or local officials. We wish to note, however, that there are safety reasons behind Guideline 17's recommendation for the uniform school bus color. Motorists associate the yellow color with school buses, and quickly recognize that a yellow bus is transporting school children. The yellow color is a signal to motorists to be especially alert around the vehicles, particularly when the buses are loading and unloading children. For these reasons, NHTSA believes all school buses should be yellow. We also want to highlight for your information that Guideline 17 is different from NHTSA's school bus safety standards, which by Federal law apply to all new school buses, regardless of State action. The school bus safety standards require new school buses to have safety systems such as energy-absorbing seats, school bus lamps, stop arms, and improved emergency exits and rearview mirrors. These requirements apply to all new school buses, no matter what the States have done to adopt them. The safety record of school buses has improved in the years since buses began to meet the school bus safety standards. I hope this information is helpful. If you have further questions, please contact Ms. Deirdre Fujita of my staff at (202) 366-2992. Sincerely,
John Womack Acting Chief Counsel Enclosure ref:571 d:9/14/95
|
1995 |
ID: 11030Open Mr. Douglas Helbig Dear Mr. Helbig: It has come to my attention that Spencer Testing Services is advertising its inspection procedure as "NHTSA approved." This representation is incorrect. NHTSA has not approved this or any other inspection procedure. Therefore, I must insist that this language be immediately removed from the advertisement and that you refrain from making such representations in any other format. Please send me a copy of the corrected advertisement without reference to the inspection procedure being NHTSA approved. Thank you for your immediate attention to this matter. Sincerely,
John Womack Acting Chief Counsel ref:304 d:7/26/95
|
1995 |
ID: 11043Open Mr. D. L. O'Connor Dear Mr. O'Connor: This responds to your telephone conversation with Walter Myers of my staff on July 12, 1995, followed up by your letter of July 13, 1995. You stated that Goodyear is encountering difficulties in exporting tires to Colombia, South America, in that Colombia wants verification that Goodyear complies with all Federal motor vehicle safety standards (FMVSS) when placing the DOT symbol on tires. You believe that Colombia will permit importation of Goodyear tires if NHTSA recognizes that Goodyear is a U.S. tire manufacturer in good standing and that Goodyear's placing the DOT symbol on its tires is accepted as valid certification of compliance by the U.S. government. As Mr. Myers stated in your telephone conversation, other U.S. tire manufacturers and exporters have had similar difficulties with Central and South American countries. All those countries regard the FMVSSs as acceptable assurances of tire safety, but they do not seem to understand or are skeptical of our system of manufacturer self-certification. They want assurances from a responsible U.S. government agency that manufacturer self-certifications are accepted as valid by the U.S. government. Enclosed is a statement similar to those that we have provided other manufacturers and exporters. Since the Federal government cannot and does not approve, certify or endorse vehicles and equipment, this statement is as far as we can go in getting the Federal government involved in what by law is essentially a manufacturer responsibility. I hope the enclosed statement will be helpful to you. Should you have further questions or need additional information, please feel free to contact Mr. Myers at this address or at (202) 366-2992. Sincerely,
John Womack Acting Chief Counsel Enclosure ref:571 d:8/9/95
|
1995 |
ID: 11044-1Open George E. Walton Dear Mr. Walton: This responds to your July 13, 1995 letter requesting an interpretation regarding the requirements of Federal Motor Vehicle Safety Standard (FMVSS) No. 205, "Glazing Materials." You stated in your letter that your client wants to know if Standard No. 205 permits the use of laminated AS-1 glass in motorcycle windshields. The answer to your question is yes. ANSI Z26.1-1977, which has been incorporated by reference into Standard No. 205, explicitly refers to item 1 glazing (defined as including laminated glass) as "Safety Glazing Material for Use Anywhere in Motor Vehicle." Motorcycles are motor vehicles. Therefore, item 1 glazing is permitted in that application. I hope this information is helpful. Please feel free to contact Paul Atelsek of my staff at this address or by telephone at (202) 366-2992 if you have any further questions or need additional information. Sincerely,
John Womack Acting Chief Counsel ref:205 d:8/4/95
|
1995 |
ID: 11047Open Ms. Yvonne Anderson Dear Ms. Anderson: This responds to your letter of July 13, 1995, concerning a van which your company is modifying. The van is owned by a local school system. The school system has asked your company to raise the roof, extend the side door, install wheelchair tiedowns, and install a wheelchair lift. The vehicle was certified as a "bus," but your modification would reduce the seating capacity so that the vehicle would become a "multipurpose passenger vehicle" (MPV). You asked whether this vehicle must be certified following the modifications. The answer to your question is no. By way of background information, the National Highway Traffic Safety Administration (NHTSA) is authorized to issue Federal motor vehicle safety standards that apply to the manufacture and sale of new motor vehicles. A vehicle must be certified as complying with all applicable safety standards before it can be sold or imported. After the first retail sale, there is a limit on modifications made to vehicles. Manufacturers, distributors, dealers, and repair businesses are prohibited from "knowingly making inoperative" any device or element of design installed on or in a motor vehicle in compliance with an applicable safety standard (49 USC '30122). In general, the "make inoperative" prohibition would require a business which modifies motor vehicles to ensure that they do not remove, disconnect, or degrade the performance of safety equipment installed in compliance with an applicable safety standard. I hope you find this information helpful. If you have any other questions, please contact Mary Versailles of my staff at this address or by phone at (202) 366-2992. Sincerely,
John Womack Acting Chief Counsel ref:VSA d:8/31/95
|
1995 |
ID: 11059Open Ms. Colleen Grant Dear Ms. Grant: This responds to your letter asking whether your 1974 Chevrolet Blazer is "street-legal." You stated that an official of the Nevada Department of Motor Vehicles has questioned whether your vehicle is street-legal because it does not have shoulder belts. According to your letter, the vehicle has a fiberglass removable roof, and was originally manufactured with lap belts. You also stated that inquiries at local dealers indicate that General Motors does not make a shoulder belt for this model "because there is no place to safely mount it." We assume that you are asking whether your vehicle was originally required to have lap/shoulder belts, because many states require vehicles in use to be equipped with the same kinds of safety belts that were required by the Federal government for the vehicles when new. As discussed below, your vehicle was not originally required to have shoulder belts, but was required to have at least lap belts at each seating position. By way of background information, the National Highway Traffic Safety Administration is authorized to issue safety standards for new motor vehicles and new motor vehicle equipment. One of the standards we have issued is Standard No. 208, Occupant Crash Protection. This standard specifies, among other things, seat belt requirements for new vehicles. Standard No. 208 generally required, for model year 1974 vehicles such as your Blazer, either a lap belt or a lap/shoulder belt at each seating position, at the manufacturer's option. Therefore, your vehicle was not originally required to have shoulder belts. I hope this information is helpful. If you have further questions, please feel free to contact Edward Glancy of my staff at (202) 366-2992. Sincerely,
John Womack Acting Chief Counsel ref:208 d:9/14/95
|
1995 |
ID: 11061safOpen Dr. Angela Mickalide Dear Dr. Mickalide: Thank you for your letter asking about the child restraint registration form required by Federal Motor Vehicle Safety Standard No. 213, Child Restraint Systems. You ask whether a child restraint manufacturer could make certain modifications to the registration form to help SAFE KIDS obtain sociodemographic and other information about the families to whom SAFE KIDS will be distributing child seats. As explained below, Standard 213 does not permit the modifications, but does permit an alternative approach. You explain in your letter that SAFE KIDS and its partners will be providing approximately 38,000 child seats to needy families through distribution sites. You would like to collect information about the recipient families' sociodemographic profile and other factors, by having the restraint manufacturer add questions to the child seat registration form. Distribution site coordinators would mail the completed forms to the manufacturer, who would then tabulate the data for SAFE KIDS' research purposes. The registration form you ask about is part of an owner registration program that NHTSA established to improve the effectiveness of manufacturer recall campaigns. The form, required by S5.8 of Standard 213, is standardized in appearance, and may not contain other material such as questions concerning the sociodemographic characteristics of the child restraint owners. A particular problem with such questions is that their presence on the registration form might cause some consumers to resist providing the information, or to conclude that the form was for warranty purposes rather than for safety recalls. As a result, they might not return the card. While we understand that you would like to modify the registration form only for the purposes of your distribution program, unfortunately we lack the authority to grant a special exemption for your situation. However, Standard 213 does permit an alternative that you suggested. In a telephone conversation with Ms. Deirdre Fujita of my staff, you said that you are considering asking the manufacturer to place the questions on a separate form and to attach that form to the child seat. That approach is fine. The registration form has to be attached to the child seat to ensure that owners will notice the form. While we want manufacturers to limit what additional materials they attach to child seats (to ensure that attachments do not distract from the form), your supplemental form should not cause a problem since your coordinators will be involved with registering the owners. Thus, there is no risk that the registration form will go unnoticed and uncompleted. I hope this information is helpful. If you have any further questions, please do not hesitate to call Ms. Fujita at (202) 366-2992. Best wishes for success in your distribution program. Sincerely,
John Womack Acting Chief Counsel ref:213 d:9/5/95
|
1995 |
ID: 11064Open Mr. Curt Stiede Dear Mr. Stiede: This responds to your letter to Walter Myers of my staff, and to subsequent telephone conversations with Mr. Myers, about this agency's standards for the product you manufacture. At Mr. Myers' request, you provided detailed schematics of your product and several pictures of it connected to various types of towed vehicles. It appears from these that the product is a trailer converter dolly. You stated that your product is intended as a towing device for a variety of trailers, such as "gooseneck flatbed, equipment, utility, farm equipment, horse trailers, along with 5th wheel recreational vehicles." You further stated that it has a combined load range of 3,500 to 15,000 pounds, depending on the trailer weight and engine power of the towing vehicle. You stated that there may be some state restrictions applicable to your trailer dolly, and suggested that some Federal regulations may have to be amended to address such a vehicle. By way of background information, this agency has the authority under Federal law to issue Federal motor vehicle safety standards (FMVSS) and related regulations applicable to new motor vehicles and new items of motor vehicle equipment. Vehicle and equipment manufacturers are responsible for "self- certifying" that their products comply with all applicable FMVSSs. They must also ensure that their products are free of safety-related defects. Once the vehicle or equipment is sold to the first retail customer, the product is no longer subject to the FMVSSs. The first question you raise is whether your trailer dolly is a "motor vehicle." The answer is yes. "Motor vehicle" is defined in 49 U.S. Code (U.S.C.) '30102 as: [A] vehicle driven or drawn by mechanical power and manufactured primarily for use on public streets, roads, and highways, but does not include a vehicle operated only on a rail line. Your trailer dolly clearly meets the definition of a motor vehicle since the dolly is designed to be drawn by mechanical power on the streets, roads, and highways. It is referred to in NHTSA regulations (49 Code of Federal Regulations (CFR), section 571.3) as a "trailer converter dolly," which is defined as "a trailer chassis equipped with one or more axles, a lower half of a fifth wheel and a drawbar." We note that a trailer converter dolly, although fabricated on a trailer chassis, is not a trailer. It is a motor vehicle designed to tow another vehicle rather than carry persons or property itself. The following standards and regulations apply to your manufacture of the trailer converter dolly. As a manufacturer of a motor vehicle, you must submit certain identifying information to NHTSA in accordance with 49 CFR Part 566, Manufacturer Identification (copy enclosed). You must also ensure that a dolly with a hydraulic braking system must meet FMVSS No. 116, Motor vehicle brake fluids (49 CFR 571.116). You must also comply with the requirements of 49 CFR Parts 567, Certification. In addition, in the event that you or NHTSA determines that your product contains a safety- related defect, you would be responsible for notifying purchasers of the defective equipment and remedying the problem free of charge. The enclosed information sheet briefly describes those responsibilities. As Mr. Myers discussed with you, since your trailer dolly is designed and intended for interstate marketing and transport, the Federal Highway Administration (FHWA) may have requirements applicable to your product. Accordingly, I will forward a copy of your letter to Mr. James Scapellato, Director, Office of Motor Carrier Research and Standards, FHWA, this address, for further response. In the alternative, you may contact Mr. Larry Minor of Mr. Scapellato's staff at this address or at (202) 366-4012 to discuss pertinent FHWA regulations. Finally, you mentioned in your letter that some states may have certain restrictions or requirements for your trailer dolly. NHTSA does not have information on those state requirements. However, you may be able to obtain such information from: American Association of Motor Vehicle Administrators 4200 Wilson Boulevard, Suite 1000 Arlington, VA 22203 (703) 522-4200 I hope this information is helpful to you. Should you have any further questions or seek additional information, please feel free to contact Mr. Myers at this address or at (202) 366-2992, or by fax at (202) 366-3820. Sincerely,
John Womack Acting Chief Counsel Enclosures
ref:116#571#566#567 d:10/16/95
|
1995 |
ID: 11082-2Open Mr. Robert J. Ponticelli Dear Mr. Ponticelli: This responds to your letter asking about how the National Highway Traffic Safety Administration's (NHTSA's) regulations apply to your product. You described your product as an aftermarket anti-theft device that is installed between the steering wheel and the steering shaft. The device is activated by "a key switch" and causes the steering wheel to become freewheeling, thus preventing actual steering of the vehicle. In an August 29, 1995 meeting with NHTSA staff, you demonstrated this device and stated that you also have plans to market it to vehicle manufacturers as original equipment. For the original equipment version of the device, you plan to incorporate a starter interrupt that will prevent the vehicle from starting while the device is in the freewheeling mode. You also requested information on how our regulations apply to regulated parties such as new car dealers and aftermarket service businesses. I will respond to your questions below. First, I will give you some background information. NHTSA is authorized to issue Federal motor vehicle safety standards (FMVSSs) for new motor vehicles and new items of motor vehicle equipment. The FMVSSs are contained in title 49, part 571 of the Code of Federal Regulations. NHTSA does not have any specific regulations covering an item of motor vehicle equipment such as your anti- theft device. However, since the steering wheel, steering column, and the area in front of the driver are among the most closely regulated parts of a vehicle, your device could affect a vehicle's compliance with several safety standards. Because the purpose of your device is to prevent vehicle theft, I will first discuss FMVSS No. 114, the safety standard that deals with theft protection. The pertinent part of Standard No. 114 requires most vehicles to "have a key-locking system which, whenever the key is removed, prevents: (a) [t]he normal activation of the vehicle's engine or motor; and (b) [e]ither steering or forward self-mobility of the vehicle or both." Most motor vehicle manufacturers have chosen to comply with this requirement by installing a steering lock. Because a device that causes the steering wheel to become freewheeling prevents actual steering, or maneuvering of the vehicle, it could also be used to meet this requirement. However, to be used as a basis for certification with FMVSS No. 114, the device would have to be activated by removal of the key that controls engine activation. In addition to possibly being used as a means of complying with FMVSS No. 114, your device could alternatively be operated by a separate key and installed in addition to a steering lock, assuming that it did not affect compliance of the vehicle with that or other safety standards. However, you should evaluate whether the device might pose a safety hazard if used without your planned starter interrupt. A driver who doesn't know (or forgets) about your device could start the vehicle in motion without realizing that the turning of the wheel is not affecting the vehicle. Other standards that you should be concerned about include FMVSS Nos. 203 (impact protection for the driver from the steering control system), 204 (steering control rearward displacement), and 208 (occupant crash protection). As our engineers explained in our meeting, even small changes to the steering column can affect vehicle compliance with these standards. Turning to the second part of your question, which legal requirements apply depends on how your product is marketed. If your product is installed by a vehicle manufacturer as original equipment, the vehicle manufacturer would have to certify that the vehicle with your device installed complies with all applicable FMVSS's, including Standard Nos. 114, 203, 204, and 208. If the device is added to a previously certified new motor vehicle prior to its first sale, e.g. by a new car dealer, the person who modifies the vehicle would be an alterer of a previously certified motor vehicle and would be required to certify that, as altered, the vehicle continues to comply with all of the safety standards affected by the alteration. If your device is installed on a used vehicle by a commercial business, such as an aftermarket service business or new car dealer, that business would have to make sure that it did not knowingly make inoperative any part of a device or element of design installed on or in a motor vehicle or item of motor vehicle equipment in compliance with an applicable FMVSS. Any violation of this "make inoperative" prohibition would subject the violator to a potential civil penalty of up to $1,000 for each violation. The "make inoperative" prohibition does not apply to modifications that vehicle owners make to their own vehicles. Thus, Federal law would not apply in situations where individual vehicle owners installed your device in their own vehicles, even if the installation were to result in the vehicle no longer complying with the safety standards. However, NHTSA encourages vehicle owners not to degrade any safety device or system installed in their vehicles. In addition, individual States have the authority to regulate modifications that individual vehicle owners may make to their vehicles, so you might wish to consult State regulations to see whether your device would be permitted. You as the product's manufacturer are subject to the requirements in sections 30118-30122 of Title 49 of the U.S. Code concerning the recall and remedy of products with defects related to motor vehicle safety. In the event that the manufacturer or NHTSA determines that the product contains a safety related defect, the manufacturer would be responsible for notifying purchasers of the defective equipment and remedying the problem free of charge. I hope this information is helpful. I am also enclosing a copy of a fact sheet titled "Information for New Manufacturers of Motor Vehicles and Motor Vehicle Equipment." It outlines other laws and regulations that you should be aware of. If you have any further questions about NHTSA's safety standards, please feel free to contact Mr. Paul Atelsek at this address or by telephone at (202) 366-2992. Sincerely,
John Womack Acting Chief Counsel Enclosure ref:114 d:9/19/95
|
1995 |
ID: 11084Open Mr. Charles Holmes Dear Mr. Holmes: This responds to your letter asking about Federal requirements for door locks and handles on a 1989 truck with a gross vehicle weight rating (GVWR) of 33,000 pounds. You state that you rented the truck from a rental company. In your letter, you described an accident you had with the rented truck. You stated that your son fell out of the vehicle when one of its doors opened as you rounded a curve. You are sure that you had locked the door. (You also said you buckled your son in a seat belt, but believe that he had unbuckled the belt.) After the accident, your son told you he had his hand "over the door handle...[and] was tring [sic] to hold on and the door came open." You ask several questions relating to requirements for "a safety lock" for the door of the truck. As explained below, our safety standards do not require trucks to have "safety locks." Let me begin with some background information about our safety requirements. Federal law authorizes the National Highway Traffic Safety Administration (NHTSA) to issue Federal motor vehicle safety standards (FMVSS) applicable to new motor vehicles and new items of motor vehicle equipment. One such standard is Safety Standard No. 206, Door Locks and Door Retention Components (copy attached). Standard No. 206 establishes certain requirements for door latches, hinges, and locks for new passenger cars and multipurpose passenger vehicles, and new trucks of all weight ratings. Each new truck must meet Standard No. 206 when the vehicle is first sold at retail. With regard to the truck in question, this means that the truck had to meet the applicable door lock requirements of Standard No. 206 when it was sold "new" to the rental company. Your first question asks whether we required the truck to have a "safety lock." Standard No. 206 requires each door on a new truck to be equipped with a lock, but without the features we believe you have in mind. When engaged, the lock has to disable the outside door handle, but not the inside handle. Some manufacturers of passenger vehicles voluntarily install "child safety locks" on some doors, which when engaged, makes the inside door handle inoperative even when the lock is in the "unlocked" position. Child safety locks are not required by NHTSA. Your next question asked whether the truck in question would be considered a passenger vehicle, since it is a "rental vehicle." The answer is no. A vehicle that is designed primarily for transporting property is a "truck" under our regulations, regardless of whether it is a rental vehicle. Your third question asked what Federal case laws reverse or overrule our regulations. Although some of our regulations have been overruled or modified pursuant to court order, FMVSS No. 206 has not been affected by court action. Your final question asked for the names and addresses of people injured in accidents similar to yours. We are unable to provide that information. Our data do not include instances in which occupants fall out of moving vehicles where there was no accident and where there were no fatalities or injuries. I hope the above information is helpful to you. Should you have any further questions of need additional information, please feel free to contact Walter Myers of my staff at this address or at (202) 366-2992, or FAX (202) 366-3820. Sincerely,
John Womack Acting Chief Counsel Enclosure ref:206 d:9/25/95
|
1995 |
Request an Interpretation
You may email your request to Interpretations.NHTSA@dot.gov or send your request in hard copy to:
The Chief Counsel
National Highway Traffic Safety Administration, W41-326
U.S. Department of Transportation
1200 New Jersey Avenue SE
Washington, DC 20590
If you want to talk to someone at NHTSA about what a request for interpretation should include, call the Office of the Chief Counsel at 202-366-2992.
Please note that NHTSA’s response will be made available in this online database, and that the incoming interpretation request may also be made publicly available.